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How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

For as long as there have been people on Earth, we have looked up at the sky and wondered about the Sun, Moon, stars, and occasional dramatic events we saw there. But it is only in the past 40 years that...more

Neptune has // Call the moon count function defined in the document head print_moon_count('neptune'); moons. As is the case with all of the gas giant planets in our Solar System, it also has a series of...more

The Giant planets do not have the same kind of structure inside that the terrestrial planets do. Their evolution was quite different than that of the terrestrial planets, and they have much more gas and...more

The South Pole of the planet Neptune is unusual in several ways. Triton, Neptune's largest moon, also has interesting features at its poles. Like Earth, Neptune's spin axis (which defines the locations...more

The atmosphere of Neptune is very similar to that of Uranus, and unlike that of Saturn and Jupiter. On Jupiter and Saturn, the atmosphere is mostly composed of the simple molecules hydrogen and helium....more

There are four ideas for the origin of a planetary atmosphere. Those four ideas are: 1. that the planet-elements of which a planet was made decomposed and released the atmosphere, 2. that the atmosphere...more

Unlike Jupiter's Great Red Spot, the Great Dark Spot of Neptune is thought to be a hole in the methane cloud deck of Neptune. The white clouds shown in the picture are above the "hole". In many images...more